Although LED street lights are more energy-efficient than high-pressure sodium lamps, they also cost real electricity bills. And the solar street light configuration for road lighting in the factory area is usually not too high, even if the cost is higher than the city circuit light, the cost of energy saving in the later stage can be completely saved. After all, the technology of solar street lamps is now mature. Generally, the battery can be used safely for more than three years. The solar LED street lamp head can be continuously illuminated for more than 100,000 hours. With the time cost calculation, the solar street lamp is more cost-effective than the city circuit lamp.